Unit IV ASSESSMENT

1.)According to the figure below, give an approximate age for the Dakota Sandstone and for the Wasatch Formation. Explain what evidence you used to determine this.

2.)Recall from your reading about the nature of volcanoes, and in your own words, compare and contrast aa and pahoehoe lava in appearance and how they form.

3.)Recall from reading the nature of volcanoes, and in your own words, briefly discuss how the rate of cooling determines the type of rock that forms from magma/lava.

4.)In your own words, compare and contrast relative age dating with radiometric dating. What are the strengths and limitations (if any) of each? Reference USGS (2001).

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